virtio: Remove extra page padding at kernel_end
virtio: Remove extra page padding at kernel_end

Consistent with 8bbb81bfb14843a856add84b907ed4bcc9baa876 on the ukvm
side.

Solo5/solo5,Weichen81/solo5,Solo5/solo5,mato/solo5,Weichen81/solo5,mato/solo5,djwillia/solo5,mato/solo5,djwillia/solo5,Weichen81/solo5,djwillia/solo5